java保存图片的代码 java如何处理图片

java 保存图片

ImageIO.write(BufferedImage, "JPG", File);

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传入Component保存图像的方法,你试试看还有没有变色。

public void cutScreen(Component com) {

Rectangle rect = com.getBounds();

BufferedImage bi = (BufferedImage) com.createImage(rect.width,

rect.height);

Graphics g = bi.getGraphics();

com.paint(g);

g.dispose();

JFileChooser jfc = new JFileChooser();

jfc.setFileFilter(new FileFilter() {

public boolean accept(File f) {

return f.isDirectory()

|| f.getName().toLowerCase().endsWith(".jpg");

}

public String getDescription() {

return "*.jpg";

}

});

int type = jfc.showSaveDialog(null);

if (type == 0) {

File file = jfc.getSelectedFile();

name = file.getName().toLowerCase();

if (!name.endsWith("jpg")) {

String path = file.getAbsolutePath();

file = new File(path + ".jpg");

for (int i = 0; file.exists(); i++) {

file = new File(path + "(" + i + ").jpg");

}

}

try {

if (!file.exists()) {

file.createNewFile();

}

ImageIO.write(bi, "JPG", file);

} catch (IOException e1) {

e1.printStackTrace();

}

}

}

求java存图片绝对路径到mysql的代码

首先,建立数据库(主意image的数据类型):

CREATE TABLE image (

id int(5) NOT NULL,

name varchar(25) default NULL,

photo blob,

PRIMARY KEY (`id`)

);

以下是Java Code:

Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/databaseName", "root", "root");

String INSERT_PICTURE = "insert into image (id, name, photo) values (?, ?, ?)";

FileInputStream fis = null;

PreparedStatement ps = null;

try {

conn.setAutoCommit(false);

File file = new File("myPhoto.png");

fis = new FileInputStream(file);

ps = conn.prepareStatement(INSERT_PICTURE);

ps.setString(1, "001");

ps.setString(2, "name");

ps.setBinaryStream(3, fis, (int) file.length());

ps.executeUpdate();

conn.commit();

} finally {

ps.close();

fis.close();

}

}

Java Graphics绘图完成后,然后怎么保存成图片的问题

使用BufferedImage、创建Graphics、然后保存这个BufferedImage。。。。。。。。

java 实现截图并且 保存在本地

import java.awt.AWTException;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.GraphicsDevice;

import java.awt.GraphicsEnvironment;

import java.awt.Rectangle;

import java.awt.Robot;

import java.awt.Toolkit;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseMotionAdapter;

import java.awt.image.BufferedImage;

import java.awt.image.RescaleOp;

import java.io.File;

import java.io.IOException;

import java.text.SimpleDateFormat;

import java.util.Date;

import javax.imageio.ImageIO;

import javax.swing.JFrame;

import javax.swing.filechooser.FileSystemView;

/**

* java截屏

* 运行后将当前屏幕截取,并最大化显示。

* 拖拽鼠标,选择自己需要的部分。

* 按Esc键保存图片到桌面,并退出程序。

* 点击右上角(没有可见的按钮),退出程序,不保存图片。

*

* @author JinCeon

*/

public class SnapshotTest {

public static void main(String[] args) {

// 全屏运行

RectD rd = new RectD();

GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment()

.getDefaultScreenDevice();

gd.setFullScreenWindow(rd);

}

}

class RectD extends JFrame {

private static final long serialVersionUID = 1L;

int orgx, orgy, endx, endy;

Dimension d = Toolkit.getDefaultToolkit().getScreenSize();

BufferedImage image;

BufferedImage tempImage;

BufferedImage saveImage;

Graphics g;

@Override

public void paint(Graphics g) {

RescaleOp ro = new RescaleOp(0.8f, 0, null);

tempImage = ro.filter(image, null);

g.drawImage(tempImage, 0, 0, this);

}

public RectD() {

snapshot();

setVisible(true);

// setSize(d);//最大化窗口

setDefaultCloseOperation(EXIT_ON_CLOSE);

this.addMouseListener(new MouseAdapter() {

public void mousePressed(MouseEvent e) {

orgx = e.getX();

orgy = e.getY();

}

});

this.addMouseMotionListener(new MouseMotionAdapter() {

public void mouseDragged(MouseEvent e) {

endx = e.getX();

endy = e.getY();

g = getGraphics();

g.drawImage(tempImage, 0, 0, RectD.this);

int x = Math.min(orgx, endx);

int y = Math.min(orgy, endy);

int width = Math.abs(endx - orgx)+1;

int height = Math.abs(endy - orgy)+1;

// 加上1,防止width或height为0

g.setColor(Color.BLUE);

g.drawRect(x-1, y-1, width+1, height+1);

//减1,加1都是为了防止图片将矩形框覆盖掉

saveImage = image.getSubimage(x, y, width, height);

g.drawImage(saveImage, x, y, RectD.this);

}

});

this.addKeyListener(new KeyAdapter() {

@Override

public void keyReleased(KeyEvent e) {

// 按Esc键退出

if (e.getKeyCode() == 27) {

saveToFile();

System.exit(0);

}

}

});

}

public void saveToFile() {

SimpleDateFormat sdf = new SimpleDateFormat("yyyymmddHHmmss");

String name = sdf.format(new Date());

File path = FileSystemView.getFileSystemView().getHomeDirectory();

String format = "jpg";

File f = new File(path + File.separator + name + "." + format);

try {

ImageIO.write(saveImage, format, f);

} catch (IOException e) {

e.printStackTrace();

}

}

public void snapshot() {

try {

Robot robot = new Robot();

Dimension d = Toolkit.getDefaultToolkit().getScreenSize();

image = robot.createScreenCapture(new Rectangle(0, 0, d.width,

d.height));

} catch (AWTException e) {

e.printStackTrace();

}

}

}

从文件中读取图片和写入图片到文件里的java代码是什么?

首先导入各种需要的包:

import java.awt.Image;

import javax.imageio.ImageIO;

import java.io.*;

读取图片的方法如下:

Image[] array = new Image[10];

Image image = ImageIO.read(new File("d:\\source.gif"));//根据你实际情况改文件路径吧

array[0] = image;

图片读出来了。

如果你有一个Image对象,想把它写入文件可以这样做:

BufferedImage image = ImageIO.read(new File("d:\\source.gif"));

//要想保存这个对象的话你要把image声明为BufferedImage 类型

ImageIO.write(image, "png", new File("f:\\test.png"));


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